Surface-grinding machine



J. C. HANSEN.

SURFACE GRINDING MACHINE.

APPLICATION FILED NOV. 30,1920.

1,404,605, Patented Jan. 24, 1922.

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' lJ lllI mnnul UNITED STATES PATENT OFFICE.

'ULIUS C. HANSEN, OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS,T0 HANSEN GRINDER COMPANY, OF COOK COUNTY, ILLINOIS, A CORPORATION OFILLINOIS.

SURFACE-GRINDING, MACHINE.

Application filed November 80, 1520.

To all whom it may concern Be it known that I, JULiUs C. IIANSEN, acitizen of the United States, residing at the city of Chicago, in thecounty of Cook and State of Illinois, have invented certain new anduseful Improvements in Surface- Grinding Machines, of which thefollowing is a specification.

My invention relates to that class of machines known as surface grindingmachines, in which the objects which it is desired to grind are placedupon a table'in proximity to a rotating abrasive disk, and are suitablyground as they are brought into contact with said disk.

One object of my said invention is to provide a disk for holding theabrasive material, and for rotation, which may be easily, quickly andaccurately adjusted upon any suitable rotating spindle for rotation in aplane at right an les to the axis of the spindle.

Another object is to provide a table for supporting the work which issimple in construction, strong, and may be easily and quickly moved,adjusted and secured in different positions as desired.

Another object is to provide a disk surface grinder which shall consistof few parts, and which can be cheaply made for use in small shops whichcannot afford the more complicated and expensive grinders now in use.

WVith the foregoing, and other objects in view, which willmoreparticularly appear in the following specification, my inventionconsists of the arrangement of parts as hereinafter described andclaimed, and while I do not wish to be restricted to the exact detailsof construction shown, yet, for the purposes of illustratin a particularembodiment thereof, reference is had to the accompanying drawings, inwhich like ref erence characters designate the same parts throughout theseveral views, and in which,

Figure 1 is a side elevation of my surface grinder, showing the abrasivedisk mounted upon the spindle of an electric motor.

Figure 2 is a rear elevation from the left in Figure l.

Figure 3 1s a section view of the arms, and the curved ways, on the linem-m of Fig. 2.

In the accompanying drawings, I have Specification of Letters Patent.

Patented Jan. 24, 1922.

Serial No. 427,705.

shown one embodiment of my said invention, in which I have mounted theparts upon a suitable base as 1, cast in one piece, and having at oneend a pedestal as 2, suitable for mounting a motor as 3, or other meansfor rotating a shaft as 5 having the abrasive disk 4: mounted upon oneend thereof. I11 the mounting of my said abrasive disk upon the shaft, Ihave preferably pro vided the end of the shaft with a taper, as shown bythe dotted lines, and I have provided the hub 7 of the abrasive disk,with a tapered socket as 6, shown in dotted lines, for accurate mountingupon said shaft. I have also provided a set screw as 8 for attaching theabrasive disk upon the shaft against accidental movement thereon. Bythis method of construction it is always possible to release the setscrew, and remove the abrasive disk quickly and easily from the shaftfor replacing it with another, when desired, and when it is desired theabrasive disk may be returned, and again mounted upon the shaft, and theoperator will always be sure that it is accurately mounted to rotate ina plane at exactly right angles to the axis of the shaft.

At a suitable distance from the face of the abrasive disk I haveprovided the work table 10, having its edge bevelled underneath, asshown. Underneath the said work table, and extending underneath theabrasive disk, I have provided two curved slideways in the base 1, saidslideways being numbered 9, 9, and extending longitudinally of saidbase, with a suitable webbing between saidmembers. I have preferablymade the curve of said slideways on that of a circle, having itscentermidway of the front edge of the work table, as by this construction,said edge of the work table is always at the same. elevation anddistance from the abrasive disk, at the various positions to which itmay be adjusted from time to time.

'The outer edges of the said slideways I have preferably made parallel,with an opening midway between for the clamping bolt 14.

Attached to the under side of the work table and extending in a forwardand downward direction, I have provided a bracket, having two curvedarms adapted to engage the slideways, as 11, 11. Said curved arms areconstructed with the same curve to the underside as the curve of theupper surface of the slideways, and the outer flanges 12, 12 parallel ontheir inner sides, and adapted to engage the outer edges of saidslideways. Midway between said arms, I have provided the slot 13 withparallel sides as shown.

To look said work table and said arms in any desired position, I haveprovided the clamping bolt 14;, passing through the'slot 13, and theopening between the members 9, 9 of the slideway, and having the head15, curved on its under side where it contacts with the Webbing of thearms 11, 11 and threaded at its lower extremity for receiving a nut, as16, for locking said clamping bolt against said slideways and said armsin whatever position it may be adjusted to.-

By this construction, the work table is easily and quickly released byturning the clamping nut 16, and after being moved to the new position,is quickly and securely locked by this nut in the new position desired.The large curve of the slideways, the

broad base formed therebetween and the long contact surface between thecurved arms and the curved slideways, gives a very firm and rigidsupport for the work table, and the large surface of contact by the headof the locking bolt, holds said work table very rigidly and securely inall positions. By making the curve of said slideways and said arms asdescribed, the front edge of the table is at a uniform distance andelevation at all the various positions to which it may be adjusted.

In my illustration, I have shown my abrasive disk as mounted directlyupon the end of the shaft of an electric motor. This is a very simple,convenient, and compact method of mounting and driving said abrasivedisk, but it will be apparent that my abrasive disk may be equally wellmounted for rotation upon the end of any revolvingshaft, as a polishinghead, or lathe, or other shafting.

When it is considered that my surface grinding machine as designedconsists of practically only three parts, the base, the work table withdepending arms, and the abrasive disk, it will be apparent how simplyand cheaply it may be constructed, and yet with the construction asshown, it is capable of all of the various adjustments that morecomplicated and expensive machines have, and that in all positions, itis rigidly and securely held in position, and can easily and quickly bemoved by simply releasing and tightening one nut.

When desired, a graduated index scale may be placed on the-"curvedslideway to facilitate the accurate and quick adjustment of the worktable to different angles desired by the operator.

Having thus described my invention, what I claim and desire to secure byLetters Patent, is the following:

1; A grinding machine, a base provided with a substantially invertedU-shaped extension having its upper sid concaved to form curvedguideways at the edges of the extension, said upper side ofthe'extension having a slot therein, a motor on the base provided with arotatable shaft, an abrasive disc on the shaft, a work table providedwith a depending curved supporting bracket of a width slightlygreater'than the width of the curved extension and whose curvature isthe sameas the curvature of the upper, sid of said extension andprovided with an opening adapted to coincide with the slot in saidextension, said curved bracket having a flange at each side edge, .theflanges adapted to overlap the edges of the extension, and a bolt andnut operating in the slot and opening of the extensionand bracket toclamp the bracket and the table in adjusted positions on the extension.

' 2. In a grinding machine, a base provided with a substantiallyinverted U-shaped extension having its upper side concave to form acurved surface and curved guideways at its edges, a motor on the baseprovided with a rotatable shaft, an abrasive disc on the shaft, a worktable provided with a relatively long curved supporting bracket whosecurvature is the same as the curvature of the upper sid of saidextension and whose width is slightly greater than the width of theextension, said curved bracket having a flange at each side edge, theflanges adapted to. overlap the curved side edges of the extension andbe guided thereby so as toguide the bracket in its movements on theextension, and means for clamping the bracket of the table and theextension together.

3. In a grinding machine, a base, a horizontally projecting,substantially inverted U-shapedextension having a concaved upper surfacecarried thereby, a motor, a work shaft for the motor and anabrasive discmounted on the said shaft, a work table carrying a depending arm of thesame curvature as the concaved surface of the ex-v tension, the saidextension and dependlng arm having openings therein to receive a,

ing therein and provided with curved guideways at its upper edges, amotor mounted on the base, a Work shaft for the motor, an abrasive discsecured to the said shaft, a work table carrying a depending curvedbracket conforming in configuration to the curved upper surface of theextension and having a slot therein, flanges at the edges of saidbracket overlapping the sides of the extension whereby horizontaldisplacement is prevented and a bolt extending through the said openingand slot for locking the work table in adjusted position.

In testimony whereof, I have hereunto signed my name to the foregoingspecification, in the presence of two attesting witnesses.

JULIUS C. HANSEN.

In presence of- GEORGE E. GOULD, CHESTER W. BROWN.

